urochord

u·ro·chord  (yr-kôrd)

n.

A notochord limited to the caudal region, characteristic of the urochordates.

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[uro- + chord.]

Thesaurus

Noun	1.	urochord - primitive marine animal having a saclike unsegmented body and a urochord that is conspicuous in the larva tunicate, urochordate chordate - any animal of the phylum Chordata having a notochord or spinal column subphylum Tunicata, subphylum Urochorda, subphylum Urochordata, Tunicata, Urochorda, Urochordata - tunicates ascidian - minute sedentary marine invertebrate having a saclike body with siphons through which water enters and leaves salp, salpa - minute floating marine tunicate having a transparent body with an opening at each end doliolum - free-swimming oceanic tunicate with a barrel-shaped transparent body larvacean - any member of the class Larvacea appendicularia - free-swimming tadpole-shaped pelagic tunicate resembling larvae of other tunicates
	2.	urochord - a notochord of a larval tunicate typically confined to the caudal region notochord - a flexible rodlike structure that forms the supporting axis of the body in the lowest chordates and lowest vertebrates and in embryos of higher vertebrates